Patent GB-190223018-A (GB)
Title: Improvements in or relating to Railway Brakes.
Inventor: PASS ERNEST DE
Filed: 1902-10-22
Granted: 1903-04-16
Abstract: 23,018. De Pass, E., [Soc. Anon. des Freins "Stop "]. Oct. 22. Brakes.-Relates to improvements in the railway brakes described in Specifications Nos. 13,339 and 22,815, A.D. 1901, and No. 14,182, A.D. 1902, rendering them applicable to all systems. At the moment of braking, a centrifugal apparatus acts to increase the pressure of the brake blocks. A friction cone d, Fig. 1, fixed to an axle of the vehicle, or any shaft connected therewith, is cast with a number of radial partitions, between which metal masses are loosely placed. When the train is running, the masses drive, by centrifugal force, a friction cone p. The rod c of the controlling- piston first acts through a bell-crank lever e, rod f, and spring g to raise a forked pivoted lever i to move a pulley a into contact with the cone d. A cable b wound on the boss of the pulley a is connected with the brake gear. The multiplying or increasing apparatus is operated in like manner by the engineman effecting a further decrease of pressure above the controlling-piston. The piston then causes a pivoted forked lever k to move the cones o, p of the friction clutch into contact, and the action of a cable s wound on the boss of the cone o is added to that of the cable b. The pressure exerted by the masses on the cone p varies with the speed of the axle, and the skidding pressure is thus automatically regulated. The power transmitted by the masses may be increased by interposing a steel band between the cone p and the masses, the ends of the band terminating in blocks which are received in recesses in adjacent masses; or the band may make two turns round the masses and act directly on stops on the cone. In this case, a band composed of two parallel strips terminating in axes adapted to bear against one of the stops when the axle is rotating in one direction is coupled to a parallel intermediate strip terminating in an axis adapted to bear against the other stop when the axle rotates in the other direction. In another arrangement, iron balls are loosely arranged in superposed layers between the masses and grooves or ribs formed on the inner periphery of the cone p. For heavy goods trucks, the cable s, Fig. 6, passes round a pulley 11 to one end of a pivoted lever 12, the other end of which is connected to the axis of the pulley, and a link 9 connected to the compressed-air brake gear may be coupled to any one of a number of holes in a rod 8, according to the load on the axle. As applied to passenger coaches provided with a vacuum brake, the cable s is connected directly to the end of the rod 8, which is permanently connected to the link passing to the brake gear. The power of the brake may be regulated by means of a spring 13, Fig. 1, connected to the lever i and to a longitudinallysliding screwed rod adjustable by a nut to regulate the tension of the spring. The screwed rod carries an index moving over a graduated scale to indicate the tension on the spring, and an adjustable setscrew regulates the backward movement of the lever i due to the spring, and thus the initial position of the controlling-piston.